{i} domed room in which images of astronomical bodies are displayed, device used to illustrate the movement of heavenly bodies (planets, stars, moons, galaxies, etc.)
A planetarium is a building where lights are shone on the ceiling to represent the planets and the stars and to show how they appear to move. a building where lights on a curved ceiling show the movements of planets and stars (planeta; PLANET). Institution devoted to popular education in astronomy and related fields, especially space science, whose main teaching tool is a hemispheric screen onto which images of celestial objects as seen from Earth are projected from an instrument also known as a planetarium, or planetarium projector. Major planetariums have extensive exhibit space, museum collections, sizable staffs, projection domes 80 ft (25 m) or more across, and seating capacities of over 600
an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
a building housing an instrument for projecting the positions of the planets onto a domed ceiling
an apparatus or model for representing the solar systems an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome a building housing an instrument for projecting the positions of the planets onto a domed ceiling